O-ethyl-s-n-propyl-o-(substituted phenyl)-phosphorothiolates

ABSTRACT

1. A PHOSPHORIC ACID ESTER OF THE FORMULA   C2H5-O-P(=O)(-S-C3H7)-O-PHENYLENE-(X)M   WHEREIN X IS HALOGEN OR LOWER ALKYL, AND M IS 1, 2 OR 3.

United States Patent ()fiice 3,839,511 Patented Oct. 1, 1974 3,839,511 O-ETHYL-S-n-PROPYL-O{SUBSTITUTED PI-IENYL)- PHOSPHOROTHIOLATES Shigeo Kishino, Tokyo, and Akio Kudamatsu and Kozo Shiokawa, Kanagawa, Japan, assignors to Bayer Aktiengesellschaft, Leverkusen, Germany No Drawing. Filed Dec. 16, 1971, Ser. No. 208,902 Claims priority, application Japan, Dec. 26, 1970, 45/118,740 Int. Cl. A01n 9/36; C07f 9/18 US. Cl. 260-964 8 Claims ABSTRACT OF THE DISCLOSURE O-ethyl-S-n-propyl-O-( substituted phenyl) phosphorothiolates of the general formula wherein X is halogen, lower alkyl, nitro, cyano, lower alkylmercapto, lower alkylsulfinyl, lower alkoxycarbonyl or lower alykl carbonyl, and

misl,2or3,

which posses insecticidal, acaricidal and nematocidal properties.

The present invention relates to and has for its objects the provision of particular new 0 ethyl-S-n-propyl-O- (substituted phenyl)phosphorothiolates, i.e. those wherein the phenyl group carries 1, 2 or 3 halogen, lower alkyl, nitro, cyano, lower alkylmercapto, lower alkylsulfinyl, lower alkoxycarbonyl or lower alkylcarbonyl groups, which possess insecticidal, acaricidal and nematocidal properties, active compositions in the form of mixtures of such compounds with solid and liquid dispersible carrier vehicles, and methods for producing such compounds and for using such compounds in a new way especially for combating pests, e.g. insects, acarids, and nematodes, with other and further objects becoming apparent from a study of the within specification and accompanying examples.

It is known that O,S dialkyl-O-phenylphosphorothiolates exhibit insecticidal activity. However, this activity is so low that they have not been used in spite of being less toxic to warm-blooded animals than the corresponding 0,0-dialkyl-O-phenylphosphorothiolates.

For example, 0,0-dimethyl O 4 nitrophenylphosphorothiolate (Compound A; common name, methylparathion) of the following formula:

CHaO s l' o m CHaO (A) has strong insecticidal activity and exhibits excellent effects, while the corresponding 0,S-dimethyl 4 nitrophenyl phosphorothiolate (Compound B) of the formula:

l. O-N0a CHsS Y (B) which has only one-third of the toxcity to warm-blooded animals has unfortunately only one-fiftieth of the insecticidal activity.

As methylparathion is very toxic to warm-blooded animals, much research has been conducted with a view to developing a noval effective insecticide with low toxicity to warm-blooded animals and has resulted in the provision of 0,0-dimethyl 0 (3-methyl-4-nitrophenyl)phosphorothiolate (Compound C; commercial name, Sumithion) and 0,0-dimethyl-O-(3-methyl 4 methylthiophenyl) 5 phosphorothiolate (Compound D; commercial name, Lebaycid).

These phosphorothiolates have been widely used as insecticides, but difiiculty has been found in controlling harmful insects which have acquired resistance to these insecticides. In such circumstances, there is a strong demand for a novel insecticide effective against resistant harmful insects.

The present invention provides compounds which have great insecticidal activity, only slight toxicity for warmblooded animals and practically no phytotoxicity, so that they can be used for controlling a great variety of harmful insects, such as harmful sucking insects, biting insects, plant parasites, hygiene pest insects and storedgrain insects.

The present invention is based on the surprising discovery that those O-alkyl-S-alkyl O phenylphosphorothiolates in which the alkyl groups are different and in which the alkyl attached to the S atom is n-propyl and the O-alkyl is ethyl have excellent insecticidal activity, very much greater for example than if the two alkyls have the same number of carbon atoms or if the alkyl attached to the S atom is alkyl other than n-propyl.

The present invention accordingly provides particular O-ethyl-S-n-propyl-O-phenyl phosphorothiolates of the following general formula:

CzH O 0 Km wherein X is halogen, lower alkyl, nitro, cyano, lower alkylmercapto, lower alkylsulfinyl, lower alkoxycarbonyl or lower alkyl carbonyl, and

m is 1, 2 or 3.

n-CaH1 S The invention also provides a process for the production of a compound according to the invention in which (a) a thiol phosphoric acid diester halide of the general formula:

o,rr.o

P-Hal n-CaHzS is reacted with a phenol of the general formula:

(III) C:HaO\ %O x... P -M (1V) is reacted with a halide of the formula:

HalC H -n (V) in which formulae Hal is halogen, M is hydrogen or a metal or ammonium, M is metal or ammonium, R is lower alkyl, and

X and m have the meanings stated with respect to formula (1).

Process variant (a) is illustrated by the following formula scheme:

Examples of X are lower alkyl groups such as methyl, ethyl, n-(or iso-) propyl, n-(or iso-, sec.- or tert.-) butyl; halogen atoms such as fluorine, chlorine, bromine or iodine; nitro, cyano, lower alkylmercapto or lower alkylsulfinyl groups; lower alkoxycarbonyl or lower alkylcarbonyl groups.

Hal is preferably chlorine. M may be ammonium, hydrogen, sodium, potassium or lithium.

Examples of the compounds of formula (III) include:

2-(or 3- or 4)-chloro (or bromo)phenol, 2,4-(or 2,5- or 2,6-)dichlorophenol, 2,4-dibromophenol,

2,4,5 (or 2,4,6-)trichlorophenol, 2,5-dichloro-4-bromophenol,

2-(or 3- or 4-)methylphenol, 4-ethylphenol,

2-iso-propylphenol, 4-tert.-butylphenol, 2-sec.-butylphenol,

2,4-(or 3,4- or 3,5-)dimethylphenol, 2-iso-propyl-S-methylphenol, 2-chloro-4-(or 5- or 6-)methylphenol, 4-chloro-2- (or 3- methylphenol, 2-chloro-4-tert.-butylphenol, 4-chloro-3,S-dimethylphenol, 2,4-dichloro6-methylphenol,

2-(or 3- or 4-)nitrophenol,

2-(or 3-)chloro-4-nitrophenol, 3-methyl-4-nitrophenol, 3-nitro-4-(or 6-)methylphenol, 2-nitro-4-chlorophenol, 2-nitro-4-methylphenol, 2,6-dichloro-4-nitrophenol, 3-nitro-4-chlorophenol,

2-(01' 4-)cyanophenol, 2-chloro-4-cyanophenol, 2-cyano-4-chlorophenol, 2-cyano-4,6-dichlorophenol,

2-( or 4-)ethoxycarbonylphenol, 2-chloro4-ethoxycarbonylphenol, 2,6-dichloro-4-ethoxycarbonylphenol, Z-methoxycarbonylphenol, 2-ethoxycarbonyl-4-chlorophenol, 2-ethoxycarbonyl-4,6-dichlorophenol, 2-(or 4-)methylcarbonylphenol, 2,6-dichloro-4-methylcarbonylphenol, 2-chloro-4-methylmercaptophenol, 4-methylmercaptophenol, 4-ethylmercaptophenol, Z-methyl-4-methylmercaptophenol, 3methyl-4-methylmercaptophenol, 3,5dimethyl-4-methylmercaptophenol, 4-methylsulfinylphenol, 2-methyl-4-methylsulfinylphenol, 3,5-dimethyl-4-methylsulfinylphenol.

Sodium or potassium salts of the corresponding phenols may be used.

In the production of the compounds of this invention according to the above method, the reaction is preferably conducted in a solvent or diluent. For this purpose any inert solvent or diluent may be used.

As the solvent or diluent there may be cited water; aliphatic, alicyclic and aromatic hydrocarbons which may be chlorinated such as hexane, cyclohexane, petroleum ether, ligroin, benzene, toluene, xylene, methylene chloride, chloroform, carbon tetrachloride, mono-, di-, and tri-chloroethylenes, and chlorobenzene; ethers such as diethyl ether, methyl ethyl ether, di-iso-propyl ether, dibutyl ether, ethylene oxide, dioxane and tetrahydrofurane; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone; nitriles such as acetonitrile, propionitrile and acrylonitrile; alcohols such as methanol, ethanol, isopropanol, butanol and ethylene glycol; esters such as ethyl acetate and amyl acetate; amides such as dimethyl formamide and dimethyl acetamide; and sulfoxides and sulfones such as dimethyl sulfoxide and sulfolane.

This process variant may be carried out in the presence of an acid binder according to need. As the acid binder there may be cited hydroxides, carbonates, bicarbonates and alcoholates of alkali metals and tertiary amines such as triethylamine, diethylaniline and pyridine.

In this process variant, the reaction may be etfected at temperatures over a broad range, but generally the reaction is carried out at temperatures ranging from about 20 C. to the boiling point of the reaction mixture, preferred temperatures being in the range from about 10 to C.

Process variant (0) is illustrated by the following formula scheme:

P M; I- Hal-CzHh-n -O S m CzH5O 0 X111 \ll /P0 M -Hal n-CzFbS Examples of the salts of O-ethyl-O-substituted phenyl thiophosphoric acid of the formula (IV) used as starting material include:

O-ethyl-O-[Z-(or 3- or 4-)chlorophenyl]-, O-ethyl-O- [2- (or 4-) brornophenyl] O-ethyl-O-[2-(or 3- or 4-)methylphenyl]-, O-ethyl-O- (4-ethylphenyl O-ethyl-O-(2-iso-propylphenyl)-,

O-ethyl-O- (4-tert.-butylphenyl) O-ethyl-O- 2-sec.-butylphenyl O-ethyl-O- (4-methylmercaptophenyl O-ethyl-O- (4-ethylmercaptophenyl) O-ethyl-O- (4-methylsulfinylphenyl O-ethyl-O-[2-(3- or 4-)nitrophenyl]-, O-ethyl-O- [2-(or 4-) cyanophenyl]-, O-ethyl-O- (Z-methoxycarbonylphenyl O-ethyl-O-[Z-(or 4-)methylcarbonylphenyl]-, O-ethyl-O- [2- (or 4-) ethoxycarbonylphenyl] O-ethyl-O-[2,4-(or 2,5- or 2,6-)dichlorophenyl]-, O-ethyl-O-(2,4-dibromophenyl), O-ethyl-O-[2,4-(3,4- or 3,5-)dimethylphenyl]-, O-ethyl-O- (2-iso-propyl-S-methylphenyl O-ethyl-O-(2-chloro-4-methylphenyl)-, O-ethyl-O- (2-chloro-6-methylphenyl O-ethyl-O-(2-chloro-5-methylphenyl)-, O-ethyl-O-(2-methyl-4-chlorophenyl)-, O-ethyl-O-(3-methyl-4-chlorophenyl)-, O-ethyl-O- (2chloro-4-tert.-butylphenyl O-ethyl-O-(3methyl4-methylmercaptphenyl)-, O-ethyl-O- (2-chloro-4-nitrophenyl O-ethyl-O-(3-chloro-4-nitrophenyl)-, O-ethyl-O- 3-methyl-4-nitrophenyl O-ethyl-O- 3-nitro-4-methylphenyl) 5 O-ethyl-O- 2-methyl-5-nitrophenyl) O-ethyl-O- (2-nitro-4-chlorophenyl O-ethyl-O- 2-nitro-4-methylphenyl) -ethyl-O-( 3-nitro-4-chlorophenyl) O-ethyl-O- (2-chlor-o-4-cyanophenyl O-ethyl-O- 2-cyano-4-chlorophenyl) O-ethyl-O- (2-chloro-4-ethoxycarbonylphenyl O-ethyl-O- 2-ethoxycarbonyl-4-chlorophenyl O-ethyl-O- 2,6-dichloro-4-methylcarbonylphenyl) O-ethyl-O- (2-chloro-4-methylmercaptophenyl O-ethyl-O- 2-methyl-4-methylmercaptophenyl O-ethyl-O- (2-methyl-4-methylsulfinylphenyl) O-ethyl-O- 2,4,5 -trichlorophenyl) O-ethyl-O- (2, 5-dichloro-4-bromophenyl) O-ethyl-O- (2,4,6-trichlorophenyl O-ethyl-O 0- 3 5 -dimethyl-4-chlorophenyl O-ethyl-O- 2,4-dichloro-6-methylphenyl) O-ethyl-O- (2,6-dichloro-4-nitrophenyl O-ethyl-O- (2-cyano-4,6-dichloropheny1) O-ethyl-O- (2, 6-dichloro-4-ethoxycarbonylphenyl) O-ethyl-O- 2-ethoxycarbonyl-4,6-dichlorophenyl) O-ethyl-O- 3 ,5 -dimethyl-4-methylmercaptophenyl or O-ethyl-O- (3 ,5 -dimethyl-4-methylsulfinylphenyl) thiophosphoric acid potassium salt and the corresponding sodium and ammonium salts.

Examples of the n-propylhalide of the formula (V) used as starting material include n-propylbromide and the corresponding chlorides.

This process variant may be carried out in the same manner as process variant (a), and the compound of the present invention can be obtained with high purity and in high yield.

As mentioned above, the compounds of the present invention can be used for controlling harmful insects of a broad range such as those belong to Coleoptera such as Rice weevil-Sitophilus oryzae Rust-red beetle-Tribolium castaneum 28-spotted lady beetle-Epilachana vigintioctopunctata Barley wireworm-Agriotes fuscz'collis Soy bean beetle- An mala rufocuprea Lepidoptera such as Gypsy moth-Lymantria dispar Tent caterpillar-Malacosoma neustria testacea Common cabbageworm-Pieris rapae crucivo ra Tobacco cutwormProdenia litura Rice-stem borer-Chile suppressalis Smaller tea tortrix-Ad xophyes orana Almond moth-Ephestia cau tella Hemiptera such as: Green rice leafhopper-Nephotettix cirzcticeps Brown planthopper--Nilaparvata lugens Comstook mealybugPseudococcus comstocki Arrowhead scale-Unaspis yananensis Green peach aphidMyzus persicae Apple aphidAphis pom-i Cabbage aphid-Brevic0ryne brassicae Orthoptera such as: German cockroach-Blatella germurtzca American cockroach-Periplaneta americana African mole cricket-Gryllotalpa africana Isoptera such as: Japanese termiteLeucotermes speratus Diptera such as: House flyMusca domestica vicina Yellow fever mosquitoAedes aegypti Seed-corn maggot-Hylemya platura Common mosquito-Culex pipz'ens Malaria mosquito-Anopheles simensis Japanese encephalistic-Culex tritaeniorhynchus mosquito Acarina such as: Carmine mite-Tetranychus telarius Citrus red mitePan0nychus citri Japanese citrus red mite-Aculus pelekassi Nematode such as: Southern roobknot nematode-Meloidogyne incognita Rice white-tip nematode-Aphelenchoiaes besseyi Soy bean cyst nematodeHeterodera glycines The active compounds according to the instant invention can be utilized, if desired, in the form of the usual formulations or compositions with conventional inert (i.e. plant compatible or herbicidally inert) pesticide diluents or extenders, i.e. diluents, carriers or extenders of the type usable in conventional pesticide formulations or compositions, e.g. conventional pesticide dispersible carrier vehicles such as gases, solutions, emulsions, suspensions, emulsifiable concentrates, spray powders, pastes, soluble powders, dusting agents, granules, etc. These are prepared in known manner, for instance by extending the active compounds with conventional pesticide dispersible liquid diluent carriers and/or dispersible solid carriers optionally with the use of carrier vehicle assistants, e.g. conventional pesticide surface-active agents, including emulsifying agents and/or dispersing agents, whereby, for example, in the case where Water is used as diluent, organic solvents may be added as auxiliary solvents. The following may be chiefly considered for use as conventional carrier vehicles for this purpose: aerosol propellants which are gaseous at normal temperatures and pressures, such as Freon; inert dispersible liquid diluent carriers, including inert organic solvents, such as aromatic hydrocarbon (e.g. benzene, toluene, xylene, alkyl naphthalenes, etc.), halogenated, especially chlorinated, aromatic hydrocarbons (e.g. chlorobenzenes, etc.), cycloalkanes (e.g. cyclohexane, etc.), paraffins (e.g. petroleum or mineral oil fractions), chlorinated aliphatic hydrocarbons (e.g. methylene chloride, chloroethylenes, etc.), alcohols (e.g. methanol, ethanol, propanol, butanol, glycol, etc.) as well as ethers and esters thereof (e.g. glycol monomethyl ether, etc.), amines (e.g. ethanolamine, etc.), amides (e.g. dimethyl formamide, etc.), snlfoxides (e.g. dimethyl sulfoxide, etc.), ketones (e.g. acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), and/or water; as well as inert dispersible finely divided solid carriers, such as ground natural minerals (e.g. kaolins, clays, alumina, silica, chalk, i.e. calcium carbonate, talc, attapulgite, montmorillonite, 'kieselguhr, etc.) and ground synthetic minerals (e.g. highly dispersed silicic acid, silicates, erg. alkali silicates, etc.); whereas the following may be chiefly considered for use as conventional carrier vehicle assistants, e.g. surfaceactive agents, for this purpose: emulsifying agents, such as non-ionic and/or anionic emulsifying agents (e.g. polyethylene oxide esters of fatty acids, polyethylene oxide ethers of fatty alcohols, alkyl sulfates, alkyl sulfonates, aryl sulfonates, etc., and especially alkyl arylpolyglycol ethers, magnesium stearate, sodium oleate, etc.); and/or dispersing agents, such as lignin, sulfite waste liquors, methyl cellulose, etc.

Such active compounds may be employed alone or in the form of mixtures with one another and/or with such solid and/or liquid dispersible carrier vehicles and/or with other known compatible active agents, especially plant protection agents, such as other insecticides, acaricides, and namatocides, or rodenticides, fungicides, bactericides, herbicides, fertilizers, growth-regulating agents, antibiotics, antiviral agents, or attractants, e.g. organic phosphorous acid esters, carbamates, dithioor (thiol) carbamates, chlorinated compounds, dinitro compounds, organic sulfur or metal compounds, substituted diphenyl ethers, anilides, urea, triazines, etc., if desired, or in the form of particular dosage preparations for specific applications made therefrom, such as solutions, emulsions, suspensions, powders, pastes, and granules which are thus ready for use.

As concerns commercially marketed preparations, these generally contemplate carrier compositions mixtures in which the active compound is present in an amount substantially between about 01-95% by Weight, and preferably 05-90% by weight, of the mixture, whereas carrier composition mixtures suitable for direct application or field application generally contemplate those in which the active compound is present in an amount substantially between about 0.000120%, preferably 0.005%, by weight of the mixture. Thus, the present invention contemplates overall compositions which comprise mixtures of a conventional dispersible carrier vehicle such as (l) a dispersible inert finely divided carrier solid, and/or (2) a dispersible carrier liquid such as an inert organic solvent and/ or water preferably including a surface-active effective amount of a carrier vehicle assistant, e.g. a surface-active agent, such as an emulsifying agent and/or a dispersing agent, and an amount of the active compound which is effective for the purpose in question and which is generally between about 0.0001-95%, and preferably 0.00595%, by weight of the mixture.

The active compounds can also be used in accordance with the well known ultra-low-volume process with good success, i.e. by applying such compound if normally a liquid, or by applying a liquid composition containing the same, via very effective atomizing equipment, in finely divided form, e.g. average particle diameter of from 50- 100 microns, or even less, i.e. mist form, for example by airplane crop spraying techniques. Only up to at most about a few liters/hectare are needed, and often amounts only up to about to 1000 g./hectare, preferably 40 to 600 g./ hectare, are sufiicient. In this process it is possible to use highly concentrated liquid compositions with said liquid carrier vehicles containing from about to about 95% by weight of the active compound or even the 100% active substance alone, e.g. about 20-100% by weight of the active compound.

Furthermore, the present invention contemplates meth ods of selectively killing, combating or controlling pests, e.g. insects, acarids, fungi, bacteria and yeasts, and more particularly methods of combating at least one of insects and acarids, which comprises applying to at least one of correspondingly (a) such insects, (b) such acarids, (0) such nematodes and (d) the corresponding habitat thereof, i.e. the locus to be protected, a correspondingly combative or toxic amount, i.e. an insecticidally, acaricidally or nematocidally effective amount of the particular active compound of the invention alone or together with a carrier vehicle as noted above.

The formulations and ready-to-use preparations may be applied in the usual manner, for instance by spraying (such as liquid spraying), misting, atomizing, dusting, scattering, watering, pouring, fumigating, soil application (such as mixing, sprinkling, vaporizing, irrigating), by surface application (such as painting, banding, dressing), by dipping or in the form of baits.

It will be realized, of course, that the concentration of the particular active compound utilized in admixture with the carrier vehicle will depend upon the intended application. Therefore, in special cases it is possible to go above or below the aforementioned concentration ranges.

The invention is illustrated by the following Examples, comprising preparative Examples 1 to 6, formulation Examples 7 to 12 and test Examples 13 to 19. In the formulation and test Examples, individual compounds according to the invention are identified by numbers corresponding to those in Table 1 following Example 6.

EXAMPLE 1 Synthesis of S-n-propyl-O-ethylchloride phosphorothiolate CaHaO O Il-CZH7S 19.3 of S-n-propyldichloride phosphorothiolate were dissolved in 100 ml. of benzene, into which a mixture consisting of 4.6 g. of ethanol, 10.1 g. of triethylamine and 20 ml. of benzene was dropped while stirring at a temperature no higher than 0 C. Upon completion of the addition, the reaction mixture was stirred at room temperature for 2 hours to complete the reaction. Then the reaction mixture was separated by filtration and the filtrate was concentrated by distillation. The residue thus obtained was distilled under reduced pressure, whereby 15 g. of S-n-propyl-O-ethylchloride phosphorothiolate was obtained. Boiling point: -74" C./0.4 mm. Hg. Refractive index n =1.4901.

15 g. of 4-tert.-butyl phenol were dissolved in ml. of benzene, to which 10.1 g. of triethylamine were added. 20.3 g. of S-n-propyl-O-ethylcliloride phosphorothiolate were added dropwise into the mixture while stirring at a temperature no higher than 10 C. Upon completion of the addition, the mixture was stirred for a while at room temperature and was then heated at 65 C. for 3 hours with stirring. Upon completion of the reaction, the mixture was washed with water, 1% hydrochloric acid, 1% sodium carbonate and water in the order mentioned and dried over anhydrous sodium sulfate. After removal of benzene by distillation, the residue was distilled under reduced pressure, whereby O-ethyl-O-(4-tert.-butylphenyl)-S-n-propyl phosphorothiolate was obtained in an amount of 25 g. Boiling point l55l56 C./0.07 mm. Hg. Refractive index n =1.S11l.

EXAMPLE 2 13.9 g. of 4-nitrophenol were dissolved in 150 ml. of benzene, to which 10.1 g. of triethylamine were added. 20.3 g. of S-n-propyl O-ethylchloride phosphorothiolate were dropped into the mixture while stirring at a temperature no higher than 10 C. Upon completion of the addition, the mixture was stirred for a while at room temperature and was then heated at 65 C. for 3 hours with stirring. Upon completion of the reaction, the mixture was washed with water, 1% hydrochloric acid, 1% sodium carbonate and water in the order mentioned and dried over anhydrous sodium sulfate. After removal of benzene by distillation, the residue was distilled under reduced pressure, whereby O-ethyl-O-(4-nitrophenyl)-S-n-propyl phosphorothiolate was obtained in an amount of 24 g. Boiling point: l59l6l C./0.025 mm. Hg. Refractive index n =1.5424.

EXAMPLE 3 Synthesis of the potassium salt of O-ethyl-O-(4-methylthiophenyl)thiophosphoric acid CzH O O 41 g. of potassium hydroxide were dissolved in 200 ml. of water, to which 250 ml. of dioxane were added. While stirring vigorously, 102 g. of O-ethyl-O-(4-methylthiophenyl)thionophosphoryl chloride were dropped in at 30- 40 C. Upon completion of the adding, the mixture was further stirred continuously for 1 hour at 60 C. to complete the reaction.

The dioxane and water were distilled off under reduced pressure and the residue was dissolved in water again. Benzene was then added to the solution. The mixture was shaken. The aqueous part was concentrated under reduced pressure and the residue was dissolved in acetone and the inorganic salt was separated by filtration. After the acetone had been distilled off, toluene was added to the residue and the precipitate formed was separated by filtration, whereby 85 g. of crude potassium O-ethyl-O-(4- methylthiophenyl)-S-n-propyl phosphorothiolate were ob- D.C3H7S 30.2 g. of the potassium salt of O-ethyl-O-(4-methylthiophenyl) thiophosphoric acid were dissolved in 80 ml. of alcohol, to which 13 g. of n-propylbromide were added. The mixture was stirred for 4 hours at 60 C. and the inorganic salt formed was separated by filtration. After the alcohol had been distilled off the residue was dissolved in benzene and washed with water, 1% sodium carbonate and water in the order mentioned. After drying with Na SO the benzene was distilled off and the residue was distilledunder reduced pressure, whereby 25 g. of O-ethyl- O (4 methylthiophenyl)-S-n-propy1 phosphorothiolate were obtained. Boiling point: 145-152 C./0.05 mm. Hg. Refractive index ri 1.55 15.

EXAMPLE 4 Synthesis of potassium O-ethyl-O-(2,4-dichlorophenyl)-thiophosphate 34 g. of potassium hydroxide were dissolved in 200 ml. of water, to which 200 ml. of dioxane were added. While the mixture was being vigorously stirred, 92 g. of O- ethyl-O- (2,4-dichlorophenyl) thiophosphoryl chloride were dropped in at 30-40 C. Upon completion of the addition, the temperature was gradually raised and the mixture was further stirred continuously for 1 hour at 60- 70 C. to complete the reaction.

The dioxane and water were distilled off under reduced pressure and the residue was dissolved in acetone and the inorganic salt was separated by filtration. After distilling acetone off, toluene and n-hexane were added to the residue and the precipitate formed was separated by 10 filtration, whereby g. of crude potassium O-ethyl-O- (2,4-dichlorophenyl) thiophosphate were obtained.

32.5 g. of potassium salt of 0-ethyl-0-(2,4-dichlorophenyl) thiophosphoric acid were dissolved in 70 ml. of alcohol, to which 13 g. of n-propyl bromide were added. The mixture was stirred for 3 hours at 70 C. and the inorganic salt formed was separated by filtration. After the alcohol had been distilled otf, the residue was dissolved in benzene and washed with water and 1% sodium carbonate. After drying with Na- SO the benzene was distilled off and the residue was distilled under reduced pressure whereby 27 g. of O-ethyl-0-(2,4dichlorophenyl)-S-n-propylphosphorothiolate were obtained. Boilin point: 155-165 C./0.25 mm. Hg. Refractive index n q=1.5362.

EXAMPLE 5 15.3 g .of O-ethyl-O-(4-methylthiophenyl)-S-n-propylphosphorothiolate, produced in Example 3(b), were dissolved in 60 ml. of glacial acetic acid. 6 g. of 30% hydrogen peroxide solution were added dropwise while the reaction temperature was maintained at 20-30 C. with external cooling. After the completion of the addition, the reaction mixture was stirred for 1 hour and then heated at 40 C. for 30 minutes to complete the reaction. The reaction mixture was diluted with water and benzene and then it was shaken. The benzene layer was washed sequentially with water, 1% sodium carbonate solution and water, and then dried over anhydrous sodium sulfate. After the benzene had been distilled 011, 14 g. of light yellowish oily O-ethyl-O-(4 methylsulfinylphenyl)-S-npropylphosphorothiolate, n =1.5496, were obtained.

EXAMPLE 6 The following Table 1 contains a list of compounds according to the invention. These compounds can be pre- 45 pared by methods analogous to those described in Examples l-5.

TABLE 1 CgHsO 0 X /P-O n-C3H1S Compound Xm Physical properties 1... 2-01 B.P.l32-143C./O.2mm.Hg my 1.5276 B.P. 130 040.1 mm. Hg m)" 1.5243 1113 15262 B.P -147 o. 0.1 mm. Hg 113 1.5457 3.1 13e-140 o./0.15 mm. H no" 1.5503 B.P 115-119 C./0.08mm H 7113 1.1502 13.1 132-139 C./0.08rnm Hg "D 1.5209 B.P 125-132? o./0.1 mm Hg my" 1.5191 13.1 1a5137 o./0.1 mm Hg 1m 1.5183 B.P 1l9121 C./0.08mm H m 1.1520 B.P. 155-155 c. 0.07 mm H my 1.5111 13.1. -140 0./0.1 mm. Hg a 1.5103 4-0 3.1. 145-152 o. 0.05 mm. Hg ne 1.5515 4-c,H5S B.P. 142453 G./0.1 mm. Hg 'llp 1.5483

B.P. 159161 c./0.25 mm. H 1m 1.5424 B.P. 153l58 C./0.2 mm. Hg n 1.5421 B.P. 151-155 (1/009 nun. H nu 1.5351 B.P. 145 149 o./0.15 mm. Hg 1m 1.5293 3.1. 143-147" 040.15 mm. Hg 111, 1.5290

B.P. 100-162 C./0.25 mm. Hg m, 1.5152

22 B.P. 153156 040.25 mm. Hg 115 15193 TABLE 1Continued Compound Xm Physical properties 23 (6 HP. 155-150 0./0.2 mm. H 11.13 1.5137

2-C2H5O C- 24 B.P. 155-150 0./0.15 mm. H m)" 1.5355

4-CH3C- 25 B P. 155-157 0./0.1 mm. H n 1.5388

2-CH1C 2,4-01: B.P. 155-155 0. 0.25 mm. H 1.5352 2501; HP. 141-145 0. 0.1 mm. H my 1.5410 2501, HP. 141-145 c. 0.15 mm. H 1.5477 2,4-Br4 HP. 154-150 0. 0.05 mm. H 771;15688 2,4-(0Hm HP. 128131 0. 0.1 mm. H my" 1.5150 3,4(01154 HP. 130-132 0./o.0s mm. H 55 15270 3,5-(CH5)4 HP. 121-123 0./0.o5 mm. H mp 1.517s 2-1so-05H1,5-0H, HP. l28 0./0.07 mm. H 55 1.5103 2-C1,4-CH1 HP. 144-151 0. 0.1 mm. H 115 1.5201 2-Cl,6-CH1 HP. 133-140 0. 0.15 mm. H 55 1.5302 2-O1,5-CH5 HP. -134 0. 0.15 mm. H 55 1.5312 4-Ol,2-OH; HP. 132-135 0./o.1 mm. H 7115 15328 4-C1,3-CH5 HP. -151 0. 0.2 mm. H 55 1.5251 201, 4-tert-C4Ho HP. 144-145 0./0 1 mm. Hg mm 1.5230 3-CH5,4-CH3S B.P. 158160 0. 0.1 mm. H 475 15500 2-Cl,4-NO4 HP. -152 0. 0.1 mm. H 55 1.5455 3-Gl,4-NO4 HP. -175 0. 0.25 mm. H 55 1.5450 3-0H5, 4-NO: HP. 154-150 0. o.07 mm. H 115 15400 3-NO2, 4-CH: HP. 147-152 0. 0.1 mm. H 115 1.5305 201 13, 5-N04 HP. 150-154 0./0.05 mm. H 115 1.5373 2-NO1, 4-01 HP. 155-157 0./0.0s mm. H 55 1.5470 2,1504, 4-CH5 HP. 155-157 0./0.15 mm. H 05 1.5318 3510., 4-01 HP. 150-154 0./o.1 mm. H 55 1.5471 2-01, 4-0N HP. 157-151 C./0.1mm. H 1715 1.5544 50 2-0N, 4-01 HP. 145-147 0./0.05 mm. H 15, 1.5450

51 HP. 150-154 0./0.2 mm. H 51, 1.5289

52 H HP. 150-154 0./0.15 mm. H 1.5215

2-C H5O 0, 4-01 53 HP. 173-175 0./0.15 mm. H 55 1.5452

2,5012, 4-0H=0- 54 Z-CHa, 4CH1S- HP. 155-150 O./0.05 mm. Hg 55 1.5500

2-0H5, 4011;5- 2,4,5-011 HP. 142-14s 0. 0.15 mm. H 115" 1.5480 2,5012. 4-Br HP. 151-155 0. 0.15 mm. H 175 1.5574 2,4501: B.P. 143-145 0 /0 05 mm. H 71: 1.5405 3,5-(CH3)2, 4-01 HP. 144-14s 0./0.1 mm. H my 1.5500 2,4-012, 50H, HP. 138-140 0./0.1 mm. H 175 1.5408 2,5-014, 4-NO4 B.P.181- 0./0.12 mm. H 77D" 1.5550 52 2-CN, 4,5-011 HP. 172-175 0./0.15 mm. H 55 1.5550

63 H 13.1. 176-180 C./0.1 mm. Hg 1m" 1.5347

54 H HP. 150-171 C./0.15 mm. H n5 1.5341

2-04H50 0, 4,5011 55. 4-CH;S-, 3,5-(CH5); HP. 14s-150 C./0.05 mm. H m5 1.5470

4-CH1S, 3,5-(CH 57 2-01, 4-0H,s HP. 153-15s 0./0.1 mm. Hg 111, 1.5550

EXAMPLE 7 emulsifiable concentrate. This formulation may be diluted Wettable powder w th water to a concentratlon of 0.05 and may be ap- 60 plied by spraying on msects and/or their hab1tat. 15 parts by weight of compound No. 26, 80 parts by EXAMPLE 9 weight of a mixture of diatomaceous earth and clay (1:5) and 5 parts by weight of the emulsifier Runnox" D st n or ed alkylaryl ether). are d ush 2 parts by weight of compound No. 21 and 98 parts by to give a wettable powder. T h1s formulatron may be diluted with water to a concentration of 0 05% and ma 65 Welght of a mlxture of talc and clay (1'3) are mlxed and bc a M ed b S raying on insects and/or their habitat y crushed to give a dust. This formulation may be applied Pp y P by dusting on insects and/or their habitat.

EXMPLE 8 EXAMPLE 1o Emulsifiable concentrate 70 Dust 30 parts by weight of compound No. 13, 30 parts by weight of xylene, 30 parts by weight of Kawakasol (aliphatic hydrocarbons with a high boiling point) and 10 parts by weight of the emulsifier Sorpol (polyoxyethylene alkylaryl ether) are mixed and stirred to give an 75 1.5 parts by weight of compound No. 5, 2 parts by weight of isopropyl hydrogen phosphate (PAP) and 96.5 parts by weight of a mixture of talc and clay (1:3) are mixed and crushed to give a dust. This formulation may be applied by dusting on insects and/or their habitat.

13 EXAMPLE 11 Granule parts by weight of compound No. 16, 10 parts by weight of bentonite, 78 parts by weight of a mixture of talc and clay (1:3) and 2 parts by weight of lignin sulphite are mixed. To this mixture 25 parts by weight of water are added and then the mixture is kneaded. It is cut into granules of about 20 to 40 mesh by means of a granulating machine. The granules are then dried at a temperature of 40 to 50 C. to give a granular formulation. This formulation may be applied by scattering on insects and/or their habitat.

oily formulation. This formulation may be applied by spraying on insects and/ or their habitat.

EXAMPLE 13 Tobacco cutworm or cotton leaf worm (Prodem'a litum) larvae test Solvent: 3 parts by weight of dimethyl formamide Emulsifier: 1 part by weight of alkylaryl polyglycol ether To prepare a suitable preparation of the active compound, 1 part by weight of the active compound was thoroughly mixed with the stated amount of solvent and the emulsifier. The emulsi-fiable concentrate obtained was then diluted with water to the prescribed concentration.

Testing method: Sweet potato leaves were dipped in the preparation of the active compound diluted to the prescribed concentration and were dried and put in a Petri dish of 9 cm. diameter. 10 tobacco cutworm larvae were then placed in the dish. The dish was kept in a constant temperature chamber at 28 C. After 24 hours, the number of dead insects was counted and the killing ratio was calculated. The results are shown in Table 2.

TABLE 2 [Test results against Prodenia litura larvae] Killing ratio (percent) Active ingredient concentration, p.p.m 1, 000 300 100 Compound number:

TABLE 2-Continued Killing ratio (percent) Active ingredient concentration, p.p.m l. 000

DE? (commercially available comparinip 'caaaaaaar; restart; 565155512 vffimaea'xan'aat 0 l DEP 0,0-dimethyl-l-hydroxy-Z,2,2-trlchl0roethyl-phosphonate.

I MPP O ,0 -dimethyl-O-l(4-methylmercapto-3-methyl)phenyl] phosphorothioate.

EXAMPLE 14 Fall webworm (Hyphantria cunea) larvae test Testing method: Mulberry leaves were dipped in the preparation of the active compound diluted to the prescribed concentration prepared in the same manner as in Example 13, and after drying in air, were placed in a Petri dish of 9 cm. diameter. 10 fall webworms were then placed in the dish and the dish was kept in a constant temperature chamber at 25 C. After 24 hours, the number of dead insects was counted and the killing ratio was calculated. The results are shown in Table 3.

TABLE 3 [Test results against Hyphtmtria cunea larvae] Killing ratio (percent) Active ingredient concentration, ppm... 1, 000 300 Compound number:

MPP (commercially available compariso Untreated control- 1 EXAMPLE Rice stem borer (Chilo .ruppressalis) larvae test Testing method: Egg masses of the rice stem borer were attached to rice, at the tillering stage, planted in a pot of 1 6 TABLE 4Continued Killing ratio (percent),

active ingredient con- Compound No. centration, 250 p.p.m.

12 cm. diameter, and on the 7th day from the hatching, 5 ml. of the preparation of the active compound diluted 32 100 to the prescribed concentration (prepared in the same 37 10o manner as in Example 13) were sprayed on to the rice. 38 100 The rice was kept in a greenhouse. Three days later, the 39 99 treated stem was examined by breaking it and the killing 10 40 ratio was calculated from the surviving borers and killed 41 100 borers. The results are shown in Table 4. TABLE 4 100 Test results against Chilo suppressalis larvae 15 51 100 Killing ratio (percent), 52 100 active ingredient con- 2 100 Compound No. centration, 250 ppm. 4 100 1 100 100 3 100 20 56 100 5 100 58 94.7 6 100 100 11 87 7 13 do 66 100 15 100 25 DEP (commercially available comparison) Untreated control 0 16 98.6 18 10o EXAMPLE 16 19 By the methods of Examples 13 to 15, and as reported 20 100 in Table 5 below, the compounds of this invention are 21 100 30 shown to exhibit excellent activity against insects belong- 23 95.5 ing to the Lepidoptera such as tobacco cutworm (Pro- 24 100 denia litura), rice stem borer (Chilo suppressalz's), fall 26 100 webworm (Hyphanlria Cunea) and the like, as compared 27 100 3 with compounds of similar structure, identified by letters 28 100 5 of the alphabet.

TABLE 5 Killing ratio (percent) Tobacco cutworm Rice-stem Fall webworm (Prodenia Zitura) borer (H phantria cunea) 1,000 300 100 250 1,000 300 100 Compounds p.p.m. p.p.m. p.p.m. p.p.m. p.p.m. p.p.m. p.p.m.

c,Hio\0 30 10 0 0 0 0 0 l IS nC;H S

C3H|0 (I) 0 0 0 0 4O 0 0 nC H|S Cl 30 5 0 0 0 n 0 Cali) (I) was CzHaS C1 100 100 100 100 100 100 100 CzHiO (I) -Q- DCaH7S Cl 10 0 0 0 50 0 0 C2H50\(") /PO- c1 n-(hHgS 21 EXAMPLE 11 Test against Green peach aphids (Myzus persicae) and Hop aphid (Phorodon humuli) (contact action) Solvent: 3 parts by weight of acetone Emulsifier: 1 part by weight of alkyl aryl polyglycol ether TABLE 6 [Results of tests on Green peach aphid and Hop aphid] Percent Green peach Hop Concenaphid aphid tration Compounds o!a.l. B A B CqH O 0.1 100 100 \H 0.02 100 100 100 100 PO- SCH; 0.004 100 100 100 100 0.0008 90 100 90 100 n-C:H1S 0.00016 03 25 100 0.000032 0..-.- 93

Compound No. 13 of the present invention.

bt 1000133136 H 0 0 0. 5 11 0.004 100 100 so 100 P-O Cl 0.0008 80 75 50 100 0.00010 30 50 25 03 n-C3H S 0000 5.-... 70

Compound N o. 20 01 the present invention.

HO S 0.1 85.---. 85.---.- c a \II 0.02 so 100 70 100 P-O- -S CH0 0.004 70 98 40 100 0.0008 15 70 25 98 CHaO 0.00016 5 40 80 CH; 0.000032 l0 30 Commercial control: Lebaycid (D):

No'rE.-A= Resistance-acquired Green peach aphid and Hop aphid B Green peach aphid and Hop aphid without resistance.

EXAMPLE 18 Carmine mite or two-spotted spider mite (Tetranychus telarius test) 3: No living imago or nymph 2: Less than 5% of living imagines and nymphs based on the untreated control 1: 650% of living imagines and nymphs based on the untreated control 0: more than 51% of living imagines and nymphs based on the untreated control The results are shown in Table 7.

TABLE 7 [Test results against Tetmnychus telurius larvae] Control efiect Active ingredient concentration, p.p.m 1, 000 300 Compound number:

CPCBS 1 (comparison) 3 2 0 CMP 2 (comparison) 3 1 0 Untreated control 0 0 0 1 CPOBS (wettable powder) =p-Chlorophenyl-pchloggbenzenesulfonate 36%; bis(4-chlorophenoxy)metan 1 8MP=0,0-diethyl-S-(2,5-dichlorophenylmercaptomethyl) dithiophosphate.

EXAMPLE 19 House fly (Musca domestica) test Testing method: 1 ml. of an emulsion of the active compound diluted to the precribed concentration prepared in the same manner as in Example 13 was applied on to a filter paper placed in a Petri dish of 9 cm. diameter. 10 mature female adult house flies were then placed in the dish and the dish was kept in a constant temperature chamber at 28 C. After 24 hours, the number of dead insects was counted and the killing ratio was calculated.

The results are shown in Table 8.

TAB LE 8 [Test results against Musca domestica adults] Killing ratio, percent Activeingredient concentration, ppm... 1, 000 100 Compound number:

13 100 14".. 100 15 100 16 100 18 .100 19.- 100 20 100 21 100 40 100 41-- 100 49.. 100 50 100 62 100 DP (comparison) 100 Untreated control 0 It will be appreciated that the instant specification and examples are set forth by way of illustration and not limitation, and that various modifications and changes may be made without departing from the spirit and scope of the present invention.

What is claimed is:

1. A phosphoric acid ester of the formula 3. The compound according to claim 1, wherein such compound is O-ethyl-O- (4-bromophenyl) -S-n-propyl phosphorothiolate of the formula CaHsO (H) n-CaH S 4. The compound according to claim 1, wherein such compound is O-ethyl-O-(2,4-dichlorophenyl)-S-n-propyl phosphorothiolate of the formula Cl CzHsO O I 11C:II1S

5. The compound according to claim 1, wherein such compound is O-ethyl-O(3,5-dimethylphenyl)-S-n-propyl phosphorothiolate of the formula 6. The compound according to claim 1, wherein such compound is O-ethyl-O-(2-chloro-4-tert.-butylphenyl)-S- n-propyl phosphorothiolate of the formula 24 7. The compound according to claim 1, wherein such compound is O-ethyl-O-(2,5-dichloro-4-bromophenyl)-S- n-propyl phosphorothiolate of the formula C1 5 CzHsO 0 I 8. The compound according to claim 1, wherein such compound is O-cthyl-O-(3,5-dimethyl-4-chlorophenyl)-S- n-propyl phosphorothiolate of the formula CH3 0,11 0 0 I \ll 0 /P c1 nC| 1S CHI References Cited UNITED STATES PATENTS 3,663,665 5/1972 Hume et al 260-964 X FOREIGN PATENTS 258,413 5/1963 Australia 260--964 1,567,444 5/1969 France 260-964 LORRAINE A. WEINBERGER, Primary Examiner R. L. RAYMOND, Assistant Examiner US. Cl. X.R.

Disclaimer 3,889,511.-Shige0 Kz'shz'no, Tokyo, and Akz'o Kuclamatsu and K020 Shiokawa, Kanagawa, J apan. O-ETHYL-S-n-PROPYL-O-(SUBSTITUTED PHENYL) -PHOSPHOROTHIOLATES. Patent dated Oct. 1, 197 4. Disclaimer filed Apr. 22, 197 6, by the assignee, Bayev" Alatz'engesellschaft. Hereby enters this disclaimer to claims 2, 3 and 4 of said patent.

[Ofiioial Gazette June 1 1.976.] 

1. A PHOSPHORIC ACID ESTER OF THE FORMULA 